KR20210018576A - Electronic device for compensating pixel value of image - Google Patents

Abstract

The present invention relates to an electronic device including a DDI circuit and a panel circuit. The DDI circuit outputs reference pixel values to be used to obtain target pixel values of a first line, and image pixel values associated with a target image. The panel circuit comprises: the first line including pixels configured to display a reference image having the target pixel values based on the reference pixel values; and a second line including pixels configured to display an image corresponding to the target image based on the image pixel values. The DDI circuit obtains the target pixel values based on the reference image, compensates for the reference pixel values based on a first difference between the obtained target pixel values and the reference pixel values, and compensates for the image pixel values based on a second difference between the reference pixel values and the image pixel values. According to the present invention, noise recognized by a user can be reduced.

Description

Electronic device for compensating the pixel value of an image {ELECTRONIC DEVICE FOR COMPENSATING PIXEL VALUE OF IMAGE}

The present invention relates to an electronic device, and more particularly, to an electronic device for compensating a pixel value of an image so that a user weakly recognizes noise generated by sensing an image.

With the development of information and communication technology, information related to various types of images is being distributed. Accordingly, electronic devices such as smart phones include display devices for transferring image information to a user. As the amount of data processed to provide image information increases, a display device with high performance is required.

The display device may generate light using various elements. For example, an OLED (Organic Light Emitting Diodes) display device may generate light by electroluminescence. Since the OLED display device has a relatively simple configuration, it is designed with a thin thickness and consumes only little power. Accordingly, OLED display devices are included in various mobile devices.

In order to improve the performance of the OLED display device, there is a need to reduce the noise of the image displayed by the OLED display device. In order to reduce the noise of the image displayed by the OLED display device, the OLED display device includes various IPs.

The present invention may provide an electronic device for detecting a pixel value of a displayed image and compensating for a pixel value of an image based on the detected pixel value.

According to an aspect of the present invention, an electronic device according to an embodiment of the present invention may include a DDI circuit and a panel circuit. The DDI circuit may output a reference pixel value to be used to obtain a target pixel value of the first line, and an image pixel value related to the target image. The panel circuit includes a first line including pixels configured to display a reference image having a target pixel value based on the reference pixel value, and pixels configured to display an image corresponding to the target image based on the image pixel value. It may include a second line including. The DDI circuit obtains a target pixel value based on the reference image, compensates the reference pixel value based on a first difference between the obtained target pixel value and the reference pixel value, and provides a first difference between the reference pixel value and the image pixel value. Image pixel values may be compensated based on the difference.

According to an aspect of the present invention, an electronic device according to an embodiment of the present invention may include a DDI circuit and a panel circuit. The DDI circuit may schedule an order for determining the target pixels, and may output reference pixel values to be used to obtain pixel values of target pixels determined according to the scheduled order. The panel circuit may display a reference image by target pixels based on the reference pixel values. The DDI circuit may detect a reference image to obtain target pixel values, and compensate image pixel values based on the acquired target pixel values, reference pixel values, and image pixel values related to the target image.

According to an aspect of the present invention, an electronic device according to an embodiment of the present invention may include a DDI circuit and a panel circuit. The DDI circuit outputs a reference pixel value to be used to obtain a target pixel value from a target line determined from among a plurality of lines during a first frame, and adjusts the reference pixel value based on the target pixel value during a second frame after the first frame. I can. The panel circuit is configured to display a first reference image having a target pixel value based on the reference pixel value output during the first frame, and display a second reference image based on the adjusted reference pixel value output during the second frame. It may include a target line including configured pixels. The pixel value of the first reference image and the pixel value of the first reference image are different, and the DDI circuit may obtain a reference pixel value by converting the first reference image.

According to an embodiment of the present invention, when an image is displayed by an electronic device, noise recognized by a user may be reduced.

1 is a block diagram showing an exemplary configuration of an electronic device according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating an exemplary configuration of the DDI of FIG. 1.
3 is a block diagram showing an exemplary configuration of the compensation IP of FIG. 2.
4 is a graph showing exemplary pixel values of an image displayed by a target line.
5 is a conceptual diagram illustrating an exemplary image displayed by a panel based on the pixel values of FIG. 4.
6 is a graph showing examples of image pixel values received by DDI and compensated image pixel values output from DDI.
7 is a graph showing examples of image pixel values received by DDI and compensated image pixel values output from DDI.
8 is a graph showing exemplary pixel values of an image displayed by a target line.
9 is a conceptual diagram illustrating an exemplary image displayed by a panel based on the pixel values of FIG. 8.
10 is a graph showing examples of image pixel values received by DDI and compensated image pixel values output from DDI.
11 is a graph showing examples of image pixel values received by DDI and compensated image pixel values output from DDI.
12 is a flowchart illustrating exemplary operations of the electronic device of FIG. 1.
13 is a block diagram showing an exemplary electronic device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described clearly and in detail to the extent that a person having ordinary knowledge in the technical field of the present invention can easily implement the present invention. In this specification, a pixel value means a characteristic value of an image to be displayed or displayed by a pixel. For example, the pixel value may mean a brightness value of an image to be displayed or displayed by the pixel. Alternatively, the pixel value refers to a characteristic value of a pixel (eg, a threshold voltage value of a pixel) related to the brightness value of the image. In this specification, when the signal represents a pixel value, it means that the signal represents data corresponding to the pixel value.

1 is a block diagram illustrating an exemplary configuration of an electronic device according to an embodiment of the present invention.

Referring to FIG. 1, the electronic device 1000 may include a processor 1100, a display driver integrated chip (DDI) 1200, and a panel 1300. As an example, the electronic device 1000 may be one of a personal computer (PC), a workstation, a notebook computer, a mobile device, a wearable device, and the like.

The processor 1100 may control/manage overall operations of components of the electronic device 1000. For example, the processor 1100 may be implemented as a general-purpose processor, a dedicated processor, or an application processor. For example, the processor 1100 includes one processor core (Single Core), or a plurality of processor cores (Multi-Core) (e.g., dual-core (Dual-Core), quad-core (Quad-Core), hexa core) It may include a multi-core such as (Hexa-Core)).

For example, the processor 1100 may include a dedicated circuit including one or more processor cores (eg, Field Programmable Gate Arrays (FPGA), Application Specific Integrated Circuits (ASICs)) or a System on Chip (SoC). For example, the processor 2100 may further include a cache memory located inside or outside.

The processor 1100 may process data related to an image. For example, the processor 1100 may process data representing information of an image to be transmitted to a user. As an example, the electronic device 1000 may process data representing information of various types of images, such as image/image information acquired by an image sensor and image/image information acquired through a communication device ( 13).

The panel 1300 may include a pixel array including a plurality of pixels and a driving circuit for operating the pixel array. As an example, the panel 1300 is at least one of various types of display structures such as a Liquid Crystal Display (LCD), Light Emitting Diodes (LED), Organic Light Emitting Diodes (OLED), and Quantum dot Light Emitting Diodes (QLED). The driving circuit of the panel 1300 may include various types of electronic circuits for operation of the pixel array.

The processor 1100 may output a signal IDAT indicating image data (hereinafter, image data) to the DDI 1200 in order to transmit image information to a user through a panel. For example, the image data may represent pixel values (hereinafter, image pixel values) of an image to be displayed by the panel 1300.

The DDI 1200 may receive a signal IDAT from the processor 1100. The DDI 1200 may obtain image pixel values based on the signal IDAT. The DDI 1200 may perform various controls on the panel 1300 based on image pixel values. For example, the DDI 1200 may perform a compensation operation on image pixel values of the signal IDAT, and may generate a signal RDAT representing the compensated image pixel values. The DID 1200 may output a signal RDAT to the panel 1300 to operate the pixels of the panel 1300.

For example, the DDI 1200 may control pixels of the panel 1300 so that an image having image pixel values is displayed by the panel based on the signal RDAT. For example, the signal RDAT may be related to control of operating voltages supplied to components inside the panel (eg, a pixel or a thin film transistor (TFT) for operating a pixel).

The DDI 1200 may select pixels to be detected (hereinafter, target pixels) among the pixels of the panel 1300. The DDI 1200 may detect and receive pixel values (hereinafter, target pixel values) of an image displayed by selected target pixels among pixels of the panel 1300. The DDI 1200 may generate reference data to be used to detect pixel values of an image that is actually displayed by target pixels. For example, the reference data may be set in advance by the designer of the electronic device 1000 (eg, before the operation of the electronic device 1000 starts, or when the electronic device 1000 is designed).

The reference data may represent reference pixel values respectively corresponding to target pixels. For example, when designing the electronic device 1000, the designer of the electronic device 1000 may set reference data indicating average values of brightness values of images displayed by the electronic device 1000 as reference pixel values. Alternatively, the designer may set reference pixel values determined according to various methods. The DDI 1200 may output a signal TDAT representing reference pixel values to the panel 1300.

As an example, the pixel array of the panel 1300 is composed of lines including pixels, and operations of the panel 1300 (eg, displaying an image, detecting pixel values, etc.) are performed in units of lines. Can be. The DDI 1200 may output a signal TDAT for controlling a line including target pixels (hereinafter, a target line) to detect target pixels. That is, the DDI 1200 may output a signal TDAT for controlling the target line and a signal RDAT for controlling lines other than the target line to the panel 1300.

Target pixels may operate based on the signal TDAT. For example, transistors corresponding to target pixels (eg, transistors for controlling the operation of target pixels) are turned on in response to a signal TDAT, and operate based on a voltage/current corresponding to a reference pixel value. can do. Accordingly, the target pixels may operate to display an image having reference pixel values of the signal TDAT. However, due to errors included in characteristic values of the pixel and the transistor corresponding to the pixel, the target pixel value of the image actually displayed by the target pixels may be different from the reference pixel value.

The target pixels may generate a signal SDAT related to an image actually displayed by the panel 1300. The panel 1300 may output the signal SDAT to the DDI 1200. The DDI 1200 may receive a signal SDAT from the panel 1300. The DDI 1200 may obtain target pixel values based on the signal SDAT.

Characteristic values of components constituting the panel 1300 (eg, threshold voltage of a transistor, mobility, etc.) may include an intrinsic error. For example, the errors may be due to a process error occurring in the process of manufacturing the panel 1300. Due to various errors included in the characteristic values, the panel 1300 may display an image having a pixel value different from the image pixel value of the signal RDAT. That is, an image including noise (hereinafter, basic noise) may be output due to an error factor inherent in the components of the panel 1300.

The DDI 1200 may perform a compensation operation to reduce basic noise. As an example, the compensation operation may include calculation operations according to various algorithms, and to perform this, the DDI 1200 may include a calculation device such as a processor or various logic circuits, but the present invention is not limited thereto. . The DDI 1200 may generate compensation data for reducing basic noise. To obtain target pixel values (ie, to detect an image displayed by the panel 1300), the DDI 1200 As the signal TDAT is output to the target pixels, the target pixels may display an image corresponding to a reference pixel value rather than an image intended by the processor 1100 (ie, an image corresponding to image data). .

For example, as the target pixels operate based on reference pixel values of the signal TDAT, an image displayed by the target line may display an image that is brighter or darker than an image intended by the processor 1100. Thus, the user can recognize the image displayed by the target line as noise. The DDI 1200 may perform a compensation operation to reduce noise (hereinafter, sensed noise) recognized by a user due to a sensing operation (ie, operations for obtaining target pixel values).

The DDI 1200 may perform a compensation operation on image pixel values so that a user weakly recognizes the detected noise.

For example, based on image pixel values and reference pixel values, image pixel values for other lines adjacent to a target line may be compensated. The DDI 1200 may output a signal RDAT representing the compensated image pixel values. The DDI 1200 may perform compensation operations to reduce detected noise recognized by a user by compensating an image of a line adjacent to the target line, rather than actually reducing noise generated by an image of the target line. That is, even if the noise actually generated by the compensation operation of the DDI 1200 is not reduced, the noise perceived by the user may be reduced.

For example, the DDI 1200 may compensate image pixel values of a next frame based on reference pixel values and image pixel values of a current frame. Rather than actually reducing noise generated by the target line in the current frame, the DDI 1200 compensates for the image displayed by the target line in the next frame, thereby reducing the detected noise perceived by the user (that is, to the user. As a result, a compensation operation may be performed so that the noise reduction is not recognized as being reduced.

As described above, as compensation operations for sensing noise, the DDI 1200 may compensate an image pixel value of a line adjacent to a target line in a current frame, or compensate an image pixel value of a target line in a next frame. As the image is displayed by the panel 1300 based on the signal RDAT representing the compensated pixel values, noise perceived by the user may be reduced.

That is, as described above with reference to FIG. 1, the DDI 1200 may perform a sensing operation to reduce the basic noise inherent in the panel 1300. In order to reduce detection noise that will be generated according to the execution of the sensing operation, the DDI 1200 may compensate for image data to be output to the panel 1300. Also, the DDI 1200 may compensate for image data to be output to the panel 1300 based on target data acquired according to a sensing operation in order to reduce basic noise.

FIG. 2 is a block diagram illustrating an exemplary configuration of the DDI of FIG. 1.

Referring to FIG. 2, the DDI 1200 may include a memory 1210, a readout IP (Intellectual Property) 1220, a compensation IP 1230, and an addition circuit 1240.

The compensation IP 1230 may generate a signal TDAT representing reference pixel values. For example, reference pixel values may be set by a designer of the electronic device 1000 and stored in the memory 1210. The compensation IP 1230 may obtain reference pixel values stored in the memory 1210 and generate a signal TDAT based on the obtained reference pixel values.

Thereafter, the target line of the panel 1300 may operate in response to the signal TDAT, and may display an image having pixel values corresponding to the reference pixel value. The panel 1300 may output a signal SDAT related to an image that is actually displayed to the readout IP 1220.

The readout IP 1220 may receive a signal SDAT from the panel 1230. The readout IP 1220 may obtain target pixel values based on the signal SDAT. For example, the readout IP 1220 may acquire a target pixel value (digital value) by converting a brightness value (analog value) of an image transmitted by the signal SDAT. The readout IP 1220 may output a signal SPV representing target pixel values to the compensation IP 1230.

The compensation IP 1230 may receive a signal SPV from the readout IP 1220. The compensation IP 1230 may acquire target pixel values based on the signal SPV. The compensation IP 1230 may store the acquired target pixel values in the memory 1210. Thereafter, the compensation IP 1230 may perform a compensation operation for reducing basic noise based on target pixel values.

Also, the compensation IP 1230 may receive a signal IDAT from the processor 1100. The compensation IP 1230 may obtain image pixel values based on the signal IDAT. Image pixel values of the compensation IP 1230 may be stored in the memory 1240. Thereafter, the compensation IP 1230 may perform a compensation operation to reduce detection noise based on the reference pixel values and the image pixel values.

For example, the compensation IP 1230 may generate compensation data for compensating image data for lines adjacent to a target line based on reference data and image data. The compensation IP 1230 may output a signal CDAT representing compensation data to the addition circuit 1240. The addition circuit 1240 may output a signal RDAT representing image data compensated based on the signals IDAT and CDAT. For example, the addition circuit 1240 may output a signal RDAT representing a value obtained by adding image pixel values of the signal IDAT and the pixel values of the signal CDAT as new image pixel values.

The compensation operations may be performed in units of lines of pixels included in the panel 1300. The compensation IP 1230 may perform scheduling for compensation operations for lines. The compensation IP 1230 may perform compensation operations on pixels included in the panel 1300 according to a scheduled order.

For example, when one line includes m pixel values, the readout IP 1220 may sequentially obtain target pixel values output from m target pixels of the target line. When the panel 1300 includes n lines, the DDI 1200 may sequentially acquire pixel values according to the order from the first line to the nth line of the panel 1300. That is, the target line may sequentially change from the first line to the nth line.

It may take a first reference time to acquire target pixel values from one target line by the readout IP 1220 (ie, a sensing operation is performed). However, the first reference time may be less than or equal to a length of time corresponding to one frame. It may take a second reference time to display an image by the lines of the panel 1300 in response to the signal RDAT. The first reference time may be longer than the second reference time.

For example, the first reference time may be tens to hundreds [us], and the second reference time may be 3 [us]. In this example, while the image corresponding to the reference pixel values is displayed by the target line, the image displayed by the other lines (i.e., the image corresponding to the image data transferred from the processor 1100) can be continuously changed. have.

Accordingly, in order to recognize the user as if the reduced noise is reduced, the compensation IP 1230 may compensate the image data of the signal RDAT in real time. Hereinafter, an exemplary configuration of the compensation IP 1230 and operations for compensation will be described in more detail with reference to FIG. 3.

3 is a block diagram showing an exemplary configuration of the compensation IP of FIG. 2.

Referring to FIG. 3, the compensation IP 1230 may include a control circuit 1231, an analysis circuit 1232, a compensation circuit 1233, and a multiplex (MUX) circuit 1234.

The control circuit 1231 may schedule an order of compensation operations for lines of the panel 1300. For example, as described with reference to FIG. 2, the control circuit 1231 may determine a target line so that the compensation operation is sequentially performed in the order from the first line to the nth line of the panel 1300. However, it will be appreciated that the control circuit 1231 may perform scheduling for performing the compensation operation based on various orders.

For example, when the current target line is determined as the third line according to the order according to scheduling, the control circuit 1231 may generate reference pixel values to be output as the third line. The control circuit 1231 may output a signal TDAT representing reference pixel values to the third line through the MUX circuit 1234. The control circuit 1231 may output a signal TDAT representing reference pixel values to the analysis circuit 1232.

The analysis circuit 1232 may receive the signal TDAT from the control circuit 1232, the signal SPV from the panel 1300, and receive the signal IDAT from the processor 1100. The analysis circuit 1232 may obtain reference pixel values based on the signal RDAT and obtain image pixel values based on the signal IDAT.

The analysis circuit 1232 may calculate difference values between acquired pixel values. For example, the analysis circuit 1232 may calculate difference values between reference pixel values for a target line and image pixel values for a line other than the target line (eg, a line adjacent to the target line). As an example, the analysis circuit 1232 may calculate difference values between reference pixel values for a target line and image pixel values. The analysis circuit 1232 may provide the calculated difference values to the compensation circuit 1233.

The compensation circuit 1233 may receive difference values from the analysis circuit 1232. For example, the compensation circuit 1233 may receive difference values between reference pixel values and image pixel values, and calculate compensation pixel values for compensating image pixel values based on the provided difference values. The compensation circuit 1233 may output a signal CDAT representing compensation pixel values to the MUX circuit 1234.

The MUX circuit 1234 may selectively output one of a signal TDAT or a signal CDAT. For example, the MUX circuit 1234 may output a signal TDAT to the panel 1300 to control pixels of a target line according to the scheduling of the control circuit 1231. Alternatively, the MUX circuit 1234 may output a signal CDAT to the addition circuit 1240 to control pixels of lines other than the target line (eg, lines adjacent to the target line) according to scheduling. Exemplary compensation operations of the compensation circuit 1233 for recognizing a user as having reduced sensing noise will be described in more detail with reference to FIGS. 4 to 11.

4 is a graph showing exemplary pixel values of an image displayed by a target line.

In the example of FIG. 4, the x-axis represents time in frames, and the y-axis represents pixel values. For better understanding, the case where the third line is determined as the target line in the second frame will be described, but it will be understood that the target line is an arbitrary line determined in any frame according to the scheduling of the control circuit 1231 . Hereinafter, referring to FIG. 4, pixels of a third line are determined as target pixels, and reference pixel values are smaller than image pixel values of the third line and image pixel values of lines adjacent to the third line (i.e., in image data). A case where a relatively bright image is displayed) will be described.

In order to obtain target pixel values from target pixels, the control circuit 1231 may output a signal TDAT representing reference pixel values to the panel 1300. The target pixels may display an image having brightness corresponding to the reference pixel value based on the reference pixel values. For example, a sensing operation for the third line may be performed in the second frame. Since the reference pixel value output for the sensing operation is smaller than the image pixel values output through the third line, the pixel value of the image actually displayed by the target pixels in the second frame may decrease from Ptg1 to Psc1.

Accordingly, in the second frame, an image having a pixel value of Psc1 instead of Ptg1 may be displayed by the panel 1300. In the second frame, as an image different from the image intended by the processor 1100 for the detection operation is output by the panel 1300, the user indicates that the image provided by the panel 1300 contains detection noise. I can recognize it. Therefore, the user can recognize noise by the image output from the second frame.

After the third frame, since the third line is not selected as the target line, the third line may output an image based on the image pixel value Ptg1. After the third frame, actual noise is not generated by the third line, but noise that is sensibly recognized by the user (eg, perceived as an afterimage generated for biological reasons) may occur.

5 is a conceptual diagram illustrating an exemplary image displayed by a panel based on the pixel values of FIG. 4. The electronic device 2000 of FIG. 5 may include the electronic device 1000 of FIG. 1. The electronic device 2000 may include a display area 2100.

For the sensing operation of the DDI 1200, the third line of the panel 1300 may display an image corresponding to the reference pixel value. As described with reference to FIG. 4, a pixel value of an image displayed by lines adjacent to the third line may be Ptg1. In this case, as the pixel value of the image displayed by the third line of the panel 1300 decreases from Ptg1 to Psc1, the image of the area corresponding to the third line is darker than the image of other areas in the display area 2100. I can.

In the example of FIG. 5, the area DA1 of the display area 2100 may correspond to the third line. Accordingly, the brightness of an image displayed in the area DA1 may be lower than the brightness of an image displayed in another area of the display area 2100 (eg, an area adjacent to the area DA1). Accordingly, a user of the electronic device 2000 may recognize an image displayed in the area DA1 as sensing noise.

6 is a graph showing examples of image pixel values received by DDI and compensated image pixel values output from DDI. In the example of FIG. 6, the x-axis represents time in frames, and the y-axis represents pixel values.

As described with reference to FIG. 2, while a sensing operation is being performed, the target line may output an image corresponding to reference pixel values instead of image pixel values. In the first to fifth frames, the image pixel value of the third line obtained based on the signal IDAT may be Ptg1. As described with reference to FIG. 4, as pixels of the third line operate based on reference data instead of image data, a pixel value of an image displayed by the third line in the second frame may decrease.

After the third frame, the sensing operation of the DDI 1200 for the third line may be terminated (ie, the target line may be changed from the third line to another line). As described with reference to FIG. 5, a relatively dark image may be displayed in the area DA1 in the second frame. The user may continuously recognize the detection noise after the third frame due to an afterimage generated by an image (sensing noise) displayed on the area DA1 in the second frame.

In order to compensate for the noise perceived by the user, the compensation circuit 1233 may generate compensation pixel values. In the example of FIG. 6, the compensation circuit 1233 may generate a signal CDAT having a compensation pixel value of PT1. In FIG. 6, an embodiment of the signal CDAT outputted from the third frame to the fifth frame is shown, but it will be understood that the length of the time period in which the signal CDAT is output may be variously changed according to the designer's setting. .

After the third frame, as the compensation pixel value PT1 is added to the image pixel value by the addition circuit 1240, the third line may operate based on the increased image pixel value. For example, pixels of the third line may display an image of increased brightness in response to the signal RDAT. Accordingly, the brightness of the image displayed in the area DA1 may increase. For example, after the third frame, the brightness of the area DA1 may be higher than the brightness of the area of the display area 2100 excluding the area DA1.

With reference to FIG. 6, an exemplary compensation operation for adjusting a reference pixel value during a time period from the third frame to the fifth frame has been described, but the number of frames in which the adjusted reference pixel value is output may be variously changed. This will make sense. For example, the control circuit 1231 may variously determine the number of frames in which the adjusted reference pixel value is output, and perform the compensation operation of FIG. 6 based on the determined number of frames.

An embodiment in which the compensation pixel value PT1 is maintained after the third frame has been described with reference to FIG. 6, but it will be understood that the compensation pixel value may vary in various ways according to a designer's setting. For example, the compensation pixel values include various factors (eg, weight), and may be variously changed according to changes in the factors. As an example, the compensation pixel value may gradually increase over time.

7 is a graph showing examples of image pixel values received by DDI and compensated image pixel values output from DDI. In the example of FIG. 7, the x-axis represents lines of pixels included in the panel 1300, and the y-axis represents pixel values.

As described with reference to FIG. 2, while a sensing operation is being performed, the target line may output an image corresponding to reference pixel values instead of image pixel values. For example, for the first to fifth lines, the DDI 1200 may receive a signal IDAT indicating an image pixel value of Ptg1. However, for the sensing operation, the DDI 1200 may output a signal TDAT indicating reference pixel values instead of image pixel values received in the second frame.

In order to compensate for the darkly displayed image in the area DA1, the compensation circuit 1233 may generate compensation pixel values for lines adjacent to the third line, which is the target line. In the example of FIG. 7, the compensation circuit 1233 may generate compensation pixel values for the first line, the second line, the fourth line, and the fifth line. The compensation pixel value for the first line and the fifth line may be PS1, and the compensation pixel value for the second line and the fourth line may be PS2. The compensation circuit 1233 may output a signal CDAT representing compensation pixel values to the addition circuit 1240.

The addition circuit 1240 may add the image pixel values of the signal PDAT and the compensation pixel values of the signal CDAT. Thus, the compensated image pixel value (i.e., the pixel value of the signal RDAT) for the first line and the fifth line is Psp2, and the compensated image pixel value (i.e., the signal ( The pixel value of RDAT) may be Psp1. The addition circuit 1240 may output a signal RDAT representing image pixel values to which the compensation pixel value is added.

The pixels of the first line, the second line, the fourth line, and the fifth line may operate based on image pixel values increased by the compensation pixel values. For example, pixels of the third line may display an image of increased brightness in response to the signal RDAT. Accordingly, the brightness of images displayed in areas adjacent to the area DA1 increases, and the user may not be able to recognize a relatively low brightness value (sensing noise) of the area DA1. Accordingly, noise caused by the sensing operation of the DDI 1200 (that is, generated when the target pixels of the third line operate based on the reference pixel value) may not be recognized by the user.

An exemplary compensation operation for adjusting image pixel values of four lines (first line, second line, fourth line, and fifth line) has been described with reference to FIG. 7, but a line subject to the compensation operation It will be appreciated that the number of can be varied in various ways. For example, the control circuit 1231 may variously determine the number of lines subject to the compensation operation, and perform a compensation operation on image pixel values of the determined lines.

Referring to FIG. 7, embodiments of the compensation pixel values PS1 and PS2 having symmetrical values with respect to the target line have been described, but it will be understood that the compensation pixel values may be variously changed according to a designer's setting. For example, the compensation pixel values include various factors (eg, weights), and may be variously changed according to changes in the factors.

An embodiment of a compensation operation for increasing image pixel values for lines adjacent to a target line has been described with reference to FIG. 7, but compensation for reducing image pixel values for lines adjacent to a target line according to a designer's setting It will be appreciated that the operation may be performed.

8 is a graph showing exemplary pixel values of an image displayed by a target line.

In the example of FIG. 8, the x-axis represents time in units of frames, and the y-axis represents pixel values. For better understanding, the case where the third line is determined as the target line in the second frame will be described, but it will be understood that the target line is an arbitrary line determined in any frame according to the scheduling of the control circuit 1231 . Hereinafter, with reference to FIG. 8, an example in which pixels of a third line are determined as target pixels and reference pixel values are larger than image pixel values for lines adjacent to the third line and the third line will be described.

In order to obtain target pixel values from target pixels, the control circuit 1231 may output a signal TDAT representing reference pixel values to the panel 1300. The target pixels may display an image having brightness corresponding to the reference pixel value based on the reference pixel values. For example, a sensing operation for the third line may be performed in the second frame. Since the reference pixel value output for the sensing operation is larger than the image pixel values output through the third line, the pixel value of the image actually displayed by the target pixels in the second frame may increase from Ptg2 to Psc2.

Accordingly, an image having a pixel value of Psc2 instead of Ptg2 may be displayed by the panel 1300 in the second frame. In the second frame, as an image different from the image intended by the processor 1100 for the detection operation is output by the panel 1300, the user indicates that the image provided by the panel 1300 contains detection noise. I can recognize it. Therefore, the user can recognize noise by the image output from the second frame.

After the third frame, since the third line is not selected as the target line, the third line may output an image based on the image pixel value Ptg2. After the third frame, no actual noise occurs, but noise that is sensibly recognized by the user (eg, perceived as an afterimage generated for biological reasons) may occur.

9 is a conceptual diagram illustrating an exemplary image displayed by a panel based on the pixel values of FIG. 8. The electronic device 3000 of FIG. 9 may include the electronic device 1000 of FIG. 1. The electronic device 3000 may include a display area 3100.

For the sensing operation of the DDI 1200, the third line of the panel 1300 may display an image corresponding to the reference pixel value. As described with reference to FIG. 8, a pixel value of an image displayed by lines adjacent to the third line may be Ptg2. In this case, as the pixel value of the image displayed by the third line of the panel 1300 increases from Ptg2 to Psc2, the image of the area corresponding to the third line is brighter than the image of other areas in the display area 3100. I can.

In the example of FIG. 9, the area DA2 of the display area 2100 may correspond to the third line. Accordingly, the brightness of an image displayed in the area DA2 may be higher than that of an image displayed in another area of the display area 3100 (eg, an area adjacent to the area DA2). Accordingly, a user of the electronic device 3000 may recognize an image displayed in the area DA2 as sensing noise.

10 is a graph showing examples of image pixel values received by DDI and compensated image pixel values output from DDI. In the example of FIG. 10, the x-axis represents time in frames, and the y-axis represents pixel values.

As described with reference to FIG. 2, while a sensing operation is being performed, the target line may output an image corresponding to reference pixel values instead of image pixel values. In the first to fifth frames, the image pixel value of the third line obtained based on the signal IDAT may be Ptg2. As described with reference to FIG. 8, as pixels of the third line operate based on reference data instead of image data, a pixel value of an image displayed by the third line in the second frame may increase.

After the third frame, the sensing operation of the DDI 1200 for the third line may be terminated (ie, the target line may be changed from the third line to another line). As described with reference to FIG. 5, a relatively dark image may be displayed in the area DA1 in the second frame. The user may continuously recognize the detection noise after the third frame due to an afterimage generated by an image (sensing noise) displayed on the area DA1 in the second frame.

In order to compensate for the noise perceived by the user, the compensation circuit 1233 may generate compensation pixel values. In the example of FIG. 10, the compensation circuit 1233 may generate a signal CDAT having a compensation pixel value of PT2. In FIG. 10, an embodiment of the signal CDAT outputted from the third frame to the fifth frame is shown, but it will be understood that the length of the time period in which the signal CDAT is output may be variously changed.

After the third frame, as the compensation pixel value "PT2" is added to the image pixel value by the addition circuit 1240, the third line may operate based on the reduced image pixel value. For example, pixels of the third line may display an image with reduced brightness in response to the signal RDAT. Accordingly, the brightness of the image displayed in the area DA2 may decrease. For example, after the third frame, the brightness of the area DA2 may be lower than the brightness of the area of the display area 3100 excluding the area DA2.

An exemplary compensation operation for adjusting a reference pixel value during a time period from the third frame to the fifth frame has been described with reference to FIG. 10, but the number of frames in which the adjusted reference pixel value is output may be variously changed. This will make sense. For example, the control circuit 1231 may variously determine the number of frames in which the adjusted reference pixel value is output, and perform the compensation operation of FIG. 10 based on the determined number of frames.

An embodiment in which the compensation pixel value PT2 is maintained after the third frame has been described with reference to FIG. 10, but it will be understood that the compensation pixel value may be variously changed according to a designer's setting. For example, the compensation pixel values include various factors (eg, weights), and may be variously changed according to changes in the factors. As an example, the compensation pixel value may gradually decrease as the frame elapses.

11 is a graph showing examples of image pixel values received by DDI and compensated image pixel values output from DDI. In the example of FIG. 11, the x-axis represents lines of pixels included in the panel 1300, and the y-axis represents pixel values.

As described with reference to FIG. 2, while a sensing operation is being performed, the target line may output an image corresponding to reference pixel values instead of image pixel values. For example, with respect to the first to fifth lines, the DDI 1200 may receive a signal IDAT indicating an image pixel value of Ptg2. However, for the sensing operation, the DDI 1200 may output a signal TDAT indicating reference pixel values instead of image pixel values received in the second frame.

In order to compensate for a brightly displayed image in the area DA2, the compensation circuit 1233 may generate compensation pixel values. In the example of FIG. 11, the compensation circuit 1233 may generate compensation pixel values for the first line, the second line, the fourth line, and the fifth line. The compensation pixel values for the first and fifth lines may be PS3, and the compensation pixel values for the second and fourth lines may be PS4. The compensation circuit 1233 may output a signal CDAT representing compensation pixel values to the addition circuit 1240.

The addition circuit 1240 may add the image pixel values of the signal PDAT and the compensation pixel values of the signal CDAT. The addition circuit 1240 may output a signal RDAT representing image pixel values to which the compensation pixel value is added. Thus, the compensated image pixel value (i.e., the pixel value of the signal RDAT) for the first line and the fifth line is Psp3, and the compensated image pixel value (i.e., the signal ( The pixel value of RDAT) may be Psp4.

The pixels of the first line, the second line, the fourth line, and the fifth line may operate based on image pixel values increased by the compensation pixel values. For example, pixels of the third line may display an image with reduced brightness in response to the signal RDAT. Accordingly, the brightness of images displayed in areas adjacent to the area DA2 decreases, and the user may not be able to recognize a relatively high brightness value (sensing noise) of the area DA2. Accordingly, noise caused by the sensing operation of the DDI 1200 (that is, generated when the target pixels of the third line operate based on the reference pixel value) may not be recognized by the user.

An exemplary compensation operation for adjusting image pixel values of four lines (first line, second line, fourth line, and fifth line) has been described with reference to FIG. 11, but a line subject to the compensation operation It will be appreciated that the number of can be varied in various ways. For example, the control circuit 1231 may variously determine the number of lines subject to the compensation operation, and perform a compensation operation on image pixel values of the determined lines.

Referring to FIG. 11, embodiments of the compensation pixel values PS3 and PS4 having symmetrical values with respect to a target line have been described, but it will be understood that the compensation pixel values may be variously changed according to a designer's setting. For example, the compensation pixel values include various factors (eg, weights), and may be variously changed according to changes in the factors.

An embodiment of a compensation operation for increasing image pixel values for lines adjacent to a target line has been described with reference to FIG. 11, but compensation for reducing image pixel values for lines adjacent to a target line according to a designer's setting It will be appreciated that an operation may be performed.

12 is a flowchart illustrating exemplary operations of the electronic device of FIG. 1.

In operation S110, the processor 1100 may generate image data representing image pixel values. As an example, image data may be associated with various types of images/videos. The processor 1100 may generate a signal IDAT representing image data.

In operation S120, the processor 1100 may output a signal IDAT to the DDI 1200.

In operation S130, the DDI 1200 may generate reference pixel values to be used to obtain target pixel values from the target pixels. The DDI 1200 may generate a signal TDAT representing reference pixel values.

In operation S140, the DDI 1200 may output a signal TDAT to the panel 1300.

In operation S150, the panel 1300 may display an image corresponding to the reference pixel value based on the signal TDAT. The panel 1300 may generate a signal SDAT representing an image actually displayed (ie, an image including basic noise) based on a reference pixel value.

In operation S160, the panel 1300 may output a signal SDAT to the DDI 1200.

In operation S170, the DDI 1200 may generate compensation pixel values to compensate for image pixel values obtained based on the signal IDAT. In order to reduce basic noise generated by the components of the panel 1300, the DDI 1200 may generate compensation pixel values based on target pixel values of the signal SDAT.

In addition, in order to reduce detection noise perceived by the user, the DDI 1200 may generate compensation pixel values based on differences between reference pixel values of the signal TDAT and image pixel values. The DDI 1200 may compensate image pixel values using the compensation pixel values, and may generate a signal RDAT representing the compensated image pixel values. For example, the DDDI 1200 may generate a signal RDAT representing the sum of the image pixel values and the compensation pixel values as a new image pixel value.

In operation S180, the DDI 1200 may output a signal RDAT to the panel 1300.

In operation S190, the panel 1300 may display an image based on the signal RDAT. A frame in which operation S190 is performed and a frame in which operation S150 is performed may be different. For example, after operation S150 is performed during the first frame, operation S190 may be performed during a second frame following the first frame. Since the signal RDAT represents the compensated image data, an image displayed based on the signal RDAT may include a small amount of basic noise, and the user may slightly sense the detection noise.

For better understanding, it is shown that operations S120 to S190 are performed after operation S110 is performed, but it will be understood that operation S110 may be performed before operation S170 in any order. For better understanding, operations S120 to S190 are shown to be performed after operation S110 is performed, but it will be understood that operation S110 may be performed in any order prior to operation S170.

13 is a block diagram illustrating an exemplary electronic device according to an embodiment of the present invention.

The electronic device 4000 of FIG. 13 may include at least one of the electronic device 1000 of FIG. 1, the electronic device 2000 of FIG. 5, and the electronic device 3000 of FIG. 9. The electronic device 4000 may be implemented as a data processing device that can use or support an interface protocol proposed by the MIPI Alliance. For example, the electronic device 4000 may be one of electronic devices such as a portable communication terminal, a personal digital assistant (PDA), a portable media player (PMP), a smart phone, a tablet computer, and a wearable device.

The electronic device 4000 may include an application processor 4100, a display device 4220, and an image sensor 4230. As an example, the application processor 4100 may include the processor 1100 of FIG. 1. The application processor 4100 may include a DigRF master 4110, a display serial interface (DSI) host 4120, a camera serial interface (CSI) host 4130, and a physical layer 4140.

The display device 4220 may include the DDI 1200 and the panel 1300 of FIG. 1. The display device 4220 may display an image based on image data provided from the application processor 4100. As an example, the application processor 4100 may provide image data to the display device 4220 in order to display the image acquired by the image sensor 4230 by the display device 4220.

The display device 4220 may display an image based on image data provided by the application processor 4100. Alternatively, the display device 4220 may display an image recognized as detection noise based on the reference data. The display device 4220 may perform compensation operations for compensating for noise (sensing noise or basic noise) of an image displayed by the panel. Exemplary compensation operations of the display device 4220 have been described with reference to FIGS. 1 to 11, and redundant descriptions are omitted below.

The DSI host 4120 may communicate with the DSI device 1225 of the display device 4220 according to the DSI. For example, a serializer SER may be implemented in the DSI host 1120. For example, a deserializer (DES) may be implemented in the DSI device 1225.

The CSI host 4130 may communicate with the CSI device 4235 of the image sensor 4230 according to the CSI. For example, a deserializer (DES) may be implemented in the CSI host 4130, and a serializer (SER) may be implemented in the CSI device 4235.

The electronic device 4000 may further include a radio frequency (RF) chip 4240 that communicates with the application processor 4100. The RF chip 4240 may include a physical layer 4242, a DigRF slave 4244, and an antenna 4246. For example, the physical layer 4242 of the RF chip 4240 and the physical layer 4140 of the application processor 4100 may exchange data with each other through the DigRF interface proposed by the MIPI Alliance.

The electronic device 4000 may further include a DRAM 4250 and a storage 4255. The DRAM 4250 and the storage 4255 may store data provided from the application processor 4100. Further, the DRAM 4250 and the storage 4255 may provide stored data to the application processor 4100.

The electronic device 4000 may communicate with an external device/system through a communication module such as a Worldwide Interoperability for Microwave Access (WIMAX) 4260, a Wireless Local Area Network (WLAN) 4262, or an Ultra Wideband (UWB) 4264). The electronic device 4000 may include a speaker 4270 and a microphone 4275 for processing voice information. The electronic device 4000 may include a Global Positioning System (GPS) device 4280 for processing location information.

The above-described contents are specific examples for carrying out the present invention. The present invention will include not only the above-described embodiments, but also embodiments that can be simply changed or easily changed. In addition, the present invention will also include techniques that can be easily modified and implemented using the embodiments. Therefore, the scope of the present invention is limited to the above-described embodiments and should not be defined, and should be determined by the claims and equivalents of the present invention as well as the claims to be described later.

1000: electronic device
2000: electronic device
3000: electronic device
4000: electronic device

Claims (10)

A DDI circuit configured to output reference pixel values to be used to obtain target pixel values of the first line, and image pixel values associated with the target image; And
The first line including pixels configured to display a reference image having the target pixel values based on the reference pixel values, and a pixel configured to display an image corresponding to the target image based on the image pixel values Including a panel circuit including the second line including the,
The DDI circuit is further configured to compensate for the image pixel values based on differences between the image pixel values and the reference pixel values. The method of claim 1,
When the reference image is displayed by the first line during a first frame, the DDI circuit is further configured to compensate for image pixel values to be output to the first line during a second frame after the first frame. Device. The method of claim 1,
The DDI circuit is further configured to output image pixel values corresponding to a plurality of lines including the second line. The method of claim 3,
The DDI circuit is further configured to compensate for the image pixel values corresponding to the plurality of lines based on differences between the image pixel values corresponding to the plurality of lines and the reference pixel values. The method of claim 4,
The DDI circuit is an electronic device further configured to determine the number of the plurality of lines. A DDI circuit configured to schedule an order for determining target pixels to be detected among the plurality of pixels, output reference pixel values to the target pixels, and output image pixel values representing a target image; And
And a panel circuit configured to display noise based on the reference pixel values and to display an image corresponding to the target image based on the image pixel values,
The DDI circuit is further configured to compensate for the image pixel values based on differences between the reference pixel values and the image pixel values. The method of claim 6,
When the frame in which the noise is displayed precedes the frame in which the image corresponding to the target image is displayed, the DDI circuit compensates the image pixel values to be output to the target pixels,
When the frame in which the noise is displayed and the frame in which the image corresponding to the target image is displayed are the same, the DDI circuit selects the image pixel values to be output to pixels different from the target pixels among the plurality of pixels. An electronic device configured to compensate. The method of claim 6,
The DDI circuit is further configured to increase the image pixel values when the noise pixel values are smaller than the image pixel values. The method of claim 6,
The DDI circuit is further configured to reduce the image pixel values when the noise pixel values are greater than the image pixel values. During a first frame, a reference pixel value is output to a first pixel and a first image pixel value to be output to a second pixel is compensated based on the reference pixel value, and during a second frame after the first frame, the second A DDI circuit configured to compensate a second image pixel value to be output as one pixel based on the reference pixel value; And
A first pixel configured to display noise based on the reference pixel value during the first frame and display a first compensation image based on a second image pixel value during the second frame, and the first pixel during the first frame A panel circuit including the second pixel, configured to display a second compensation image based on one image pixel value,
An electronic device in which the pixel value of the noise and the pixel value of the first compensation image are different, and the pixel value of the noise and the pixel value of the second compensation image are different.

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